24LC32AXT-I/ST

Memory IC Overview

The Microchip Technology 24LC32AT-I/ST is a 32-Kbit Electrically Erasable PROM organized as a single block of 4K x 8-bit memory. It features a two-wire I2C compatible serial interface with a maximum clock frequency of 400 kHz for VCC between 2.5V and 5.5V, or 100 kHz for lower voltages. The device operates within a supply voltage range of 2.5V to 5.5V and supports an industrial temperature range of -40°C to +85°C. Key electrical characteristics include a typical standby current of 1 µA and an active current of 1 mA. It offers a page write buffer of up to 32 bytes, a maximum write cycle time of 5 ms, and data retention exceeding 200 years.

Memory IC Feature Summary

• Supports bidirectional two-wire serial communication via I2C protocol with Schmitt trigger inputs for noise suppression.
• Includes hardware write-protect functionality controlled by the WP pin to inhibit array writes when tied high.
• Features a 32-byte page write buffer allowing efficient sequential data storage without repeated start conditions.
• Provides acknowledge polling capability to maximize bus throughput during internal self-timed erase/write cycles.

Memory IC Applications

• Personal communications devices requiring low-power non-volatile data storage
• Data acquisition systems needing reliable parameter retention
• Industrial control applications operating in extended temperature environments

Memory IC Procurement Notes

Verify that the ordering suffix 'I' corresponds to the Industrial temperature range (-40°C to +85°C) and '/ST' indicates the 8-Lead TSSOP package. Confirm the 'T' suffix denotes tape and reel packaging if required for automated assembly. Ensure the design supports the 2.5V minimum supply voltage specific to the LC series, distinct from the AA series 1.7V operation.

Memory IC Selection Notes

Select this component for designs requiring 32-Kbit capacity with I2C connectivity. The Industrial grade variant is suitable for general-purpose electronics operating in moderate thermal conditions. Consider the MSOP or DFN packages if board space is constrained, noting that address pins A0-A2 are available on the TSSOP package for multi-device bus expansion.

Memory IC Part Context

This part belongs to the 24AA32A/24LC32A family of 32-Kbit serial EEPROMs manufactured by Microchip Technology. The LC designation specifically indicates a 2.5V minimum operating voltage, distinguishing it from the AA series which supports 1.7V operation. The device utilizes CMOS technology for low power consumption and is RoHS compliant.

Memory IC Replacement Considerations

The 24LC32AT-I/MS serves as a direct package alternative using the 8-Lead MSOP form factor while maintaining identical electrical specifications and pinout compatibility.

Memory IC FAQ

How does the WP pin affect write operations?

When the WP pin is tied to VCC, write operations to the entire array are inhibited, though read operations remain unaffected. When tied to VSS, write protection is disabled.

What is the maximum number of devices supported on a single bus?

Up to eight 24LC32A devices can be connected to the same bus using the three chip select address lines (A0, A1, A2) to expand the address space.